Which character of William Shakespeare says "life's ... a tale told by an idiot, full of sound and fury, signifying nothing."?

In William Shakespeare's play "Macbeth" in Act 5, Scene 5, it is a shocked Macbeth who speaks numbly about the passage of time and declares famously that life's ... “a tale told by an idiot, full of sound and fury, signifying nothing” (Act V, Scene V, 25–27). Macbeth utters these lines after being told of the death of his wife.

To best understand this quote, the entire context in which it is made must to be viewed. Early in his soliloquy, Macbeth says: "Tomorrow, and tomorrow, and tomorrow, Creeps in this petty pace from day to day, To the last syllable of recorded time; And all our yesterdays have lighted fools The way to dusty death. Out, out, brief candle! Life's but a walking shadow, a poor player, that struts and frets his hour upon the stage, And then is heard no more. It is a tale told by an idiot, full of sound and fury, signifying nothing."

For Macbeth, he finally sees that life is meaningless. Life lasts for a brief moment and is full of nothing. In the end, Macbeth holds that life is inconsequential. He has realized that all of his efforts to become king and keep the throne have come to no end. Nothing key that he has planned in his life has come true! He acted like an idot. He made noise and caused emotional disturbances which were devoid of all meaning.